Sk Telecom Company, Ltd.

Hyemin Jun

Byeungwoo Jeon

Yunglyul Lee

Haekwang Kim

Joohee Moon

Daeyeon Kim

HaYoon Kim

Hayoon Kim

The present disclosure relates to an intra prediction method and apparatus and an image encoding/decoding method and apparatus using the same. The disclosure provides the intra prediction apparatus that predicts the pixel values of respective pixels in a current block by weight-averaging the pixel values of one or more adjacent pixels in neighboring blocks to the current block according to the distances between each pixel in the current block and the adjacent pixel(s). According to the disclosure, the current block to be encoded can be predicted more accurately so that the encoding efficiency is improved by reducing the difference between the original block and the predicted block, and thereby video compression efficiency can be improved.

Intra prediction method and apparatus, and image encoding/decoding method and apparatus using same

A video encoding apparatus using an intra prediction, includes: an intra predictor to predict a current block from a plurality of neighboring blocks of the current block; a subtractor to generate residual signals by subtracting predicted pixels in the predicted block from pixels in the current block; a transformer to transform the residual signals into a frequency domain; a quantizer to quantize the transformed residual signals; and an encoder to encode the quantized residual signals into a bitstream, wherein the intra predictor includes: a weighted pixel calculator configured to calculate a plurality of weighted pixel values of pixels selected in the neighboring blocks by applying weights to the pixels selected in the neighboring blocks.

A video decoding apparatus using an intra prediction, includes: a decoder to decode a bitstream to thereby extract residual signals; an inverse quantizer to inversely quantize the residual signals; an inverse transformer to inversely transform the inversely quantized residual signals; an intra predictor to predict a current block from a plurality of neighboring blocks of the current block; and an adder to add the inversely transformed residual signals to the predicted pixels in the predicted block, wherein the intra predictor includes a weighted pixel calculator to calculate a plurality of weighted pixel values of pixels selected in the neighboring blocks by applying weights to the pixels selected in the neighboring blocks, the weights being decided variably based on a position of a current pixel to be predicted in the current block; and a pixel predictor to derive a predicted pixel value of the current pixel using the weighted pixel values.

A video decoding method using an intra prediction, includes: predicting a current block from a plurality of neighboring blocks of the current block; decoding a bitstream to thereby extract residual signals; inversely quantizing the residual signals; inversely transforming the inversely quantized residual signals; and adding the inversely transformed residual signals to the predicted pixels in the predicted block, wherein the prediction of the current block comprises: calculating a plurality of weighted pixel values of pixels selected in the neighboring blocks by applying weights to the pixels selected in the neighboring blocks, wherein the weights are decided variably based on a position of a current pixel to be predicted in the current block; and deriving a predicted pixel value of the current pixel using the weighted pixel values.

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Seoul, South Korea

Hyemin Jun